Definition:Time/Unit/Month
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Definition
The month is a derived unit of time.
The month is measured only approximately in duration, and is not used as a scientific measure.
- $1$ month is between $28$ and $31$ days, depending on which month it is.
Lunar Month
The lunar month is defined as the length of time between $2$ new moons.
- $1$ lunar month $\approx 29 \cdotp 530588$ days
or:
Linguistic Note
The word month derives from the word moon, from its definition as the approximate duration of one full cycle of phases from new moon to new moon.